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pH-dependent activation of cytokinesis modulates Escherichia coli cell size

机译:Cytokinesis的pH依赖性激活调节<斜斜体>大肠杆菌和斜体>细胞尺寸

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Cell size is a complex trait, derived from both genetic and environmental factors. Environmental determinants of bacterial cell size identified to date primarily target assembly of cytosolic components of the cell division machinery. Whether certain environmental cues also impact cell size through changes in the assembly or activity of extracytoplasmic division proteins remains an open question. Here, we identify extracellular pH as a modulator of cell division and a significant determinant of cell size across evolutionarily distant bacterial species. In the Gram-negative model organism Escherichia coli , our data indicate environmental pH impacts the length at which cells divide by altering the ability of the terminal cell division protein FtsN to localize to the cytokinetic ring where it activates division. Acidic environments lead to enrichment of FtsN at the septum and activation of division at a reduced cell length. Alkaline pH inhibits FtsN localization and suppresses division activation. Altogether, our work reveals a previously unappreciated role for pH in bacterial cell size control.
机译:细胞尺寸是一种复杂的性状,来自遗传和环境因素。迄今鉴定的细菌细胞大小的环境决定因素主要是细胞分裂机械细胞骨组分的靶向组装。某些环境提示还通过组装或外晶分区蛋白的组装或活性的变化影响细胞大小仍然是一个开放的问题。在此,我们将细胞外pH鉴定为细胞分裂的调节剂和在进化的远处细菌物种中的细胞大小的显着决定因素。在革兰氏阴性模型生物大肠杆菌中,我们的数据表明,环境pH通过改变终端细胞分裂蛋白FTSN定位到激活分裂的细胞内环的能力来撞击细胞分裂的长度。酸性环境导致在隔膜中富集FTSN,并在降低的细胞长度下激活分裂。碱性pH抑制FTSN定位并抑制分裂激活。完全,我们的作品揭示了在细菌细胞大小控制中对pH的过分未覆的作用。

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